package com.eshop.we.utils;




import com.sun.org.apache.xml.internal.security.utils.Base64;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

/**
 * @author youkuanwei
 * @create 2017-09-04 下午1:20
 **/
public class DesUtil {
    /*
* 加密用的Key 可以用26个字母和数字组成
* 此处使用AES-128-CBC加密模式，key需要为16位。
*/
    private String sKey="0123456789abcdef";
    private String ivParameter="0123456789abcdef";
    private static DesUtil instance=null;
    private DesUtil(){

    }
    public static DesUtil getInstance(){
        if (instance==null)
            instance= new DesUtil();
        return instance;
    }
    // 加密
    public String encrypt(String sSrc) throws Exception {
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        byte[] raw = sKey.getBytes();
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());//使用CBC模式，需要一个向量iv，可增加加密算法的强度
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
        return Base64.encode(encrypted);//此处使用BASE64做转码。
    }

    // 解密
    public String decrypt(String sSrc) throws Exception {
        try {
            byte[] raw = sKey.getBytes("ASCII");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
            byte[] encrypted1 = Base64.decode(sSrc);//先用base64解密
            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original,"utf-8");
            return originalString;
        } catch (Exception ex) {
            return null;
        }
    }

    public static void main(String[] args) throws Exception {
// 需要加密的字串
        String cSrc = "我来自www.soundgroup.com";
        System.out.println(cSrc);
// 加密
        long lStart = System.currentTimeMillis();
        String enString = DesUtil.getInstance().encrypt(cSrc);
        System.out.println("加密后的字串是：" + enString);

        long lUseTime = System.currentTimeMillis()-lStart;
        System.out.println("加密耗时：" + lUseTime + "毫秒");
// 解密
        lStart = System.currentTimeMillis();
        String DeString = DesUtil.getInstance().decrypt(enString);
        System.out.println("解密后的字串是：" + DeString);
        lUseTime = System.currentTimeMillis()-lStart;
        System.out.println("解密耗时：" + lUseTime + "毫秒");
    }
}
